In message .com,
writes

It may try to regrow from the bits of root that you can't dig out, but
I would not recommend a wild elderberry tree for a small suburban
garden. It is too much of a weed.


If it was there already and they were happy with it, they could be
allowed to have another one.

It probably won't regrow, but elders are short-lived and seed freely:
just thin out the seedlings as they grow.

--
Sue ]